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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc3ddb8152cae896c0b9a8b9e1d616ecc51206b4c359eedb1c1442bc859bfab' 
  AND token = 'FB3sN89n2aWpW+heJs8qu0N/9KebT0JuSHJ9pq7aVx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}